First of all, welcome to Ultros. There are hunt linkshells but your best bet is a cross world one. Most people now are using the Primal hunt discord as a means to try to get hunts done.

The discord’s invite link is
https://discord.gg/PDccXKC

As for the role specific linkshells I am not presently aware of any of those! If I come across one I will update. Most people use the balance discord or look up guides.